Thanks a million guys!
Peter, will hooking up the second relief valve allow continued water spillage? I assume that is the reason for the pressure limiting valve.?
Right now, when it does this, the flow of water from the TPR valve is continuous (and the loud groaning noise maddening), not just when the burners are fired – leading to extremely high water bills and a constantly wet basement floor. The drain is in the middle of the floor in the area where the WH is located so a pipe run all the way to the drain becomes a trip hazard.
You guys are awesome!